Sofa



FIG. 1 is a top view my new sofa design;

FIG. 2 is a rear perspective view thereof;

FIG. 3 is a front perspective view thereof;

FIG. 4 is a rear perspective view thereof;

FIG. 5 is a side perspective view thereof; and,

FIG. 6 is a side perspective view thereof. 

I claim the ornamental design for a sofa, as shown and described. 